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7-zip 9.28b - Compression Performance: 7-zip, Magicrar, Winrar, Winzip

7-Zip (64-bit version) | PCWorld

7-Zip is the only one of our four archiving and compression tools thats free. Its open source and offered under the GNU Lesser General Public License. 7-Zip fully supports the following seven compression formats: 7z, bzip2, GZIP, TAR, WIM, XZ, and ZIP. Additionally, 7-Zip can extract an additional 24 formats: ARJ, CAB, CHM, cpio, cramfs, DEB, DMG, FAT, HFS, ISO, LZH, LZMA, MBR, MSI, NSIS, NTFS, RAR, RPM, SquashFS, UDF, VHD, WIM, XAR, and Z. According to its webpage, 7-Zips compression performance for ZIP and GZIP formats is between 2 and 10 percent superior to that of its competition, and our benchmarks support this claim. The app's excellent support for its own 7z compression and archiving format is another strong point. 7z is based on an open architecture with optional 256-bit AES encryption. This format achieved the highest compression rates in our benchmarks. 7-Zip defaults to the Lempel-Ziv-Markov Algorithm (LZMA) for compression with 7z, but it can also be configured to use LZMA2, PPMd, and bzip2. Moreover, it supports WinZip AES encryption, making it possible to create ZIP archives with 256-bit AES encryption.

Original article here: http://www.tomshardware.com/reviews/winrar-winzip-7-zip-magicrar,3436-2.html

Compression Performance: 7-Zip, MagicRAR, WinRAR, WinZip - Compression: Your Data, On A Diet

Note that I call it a difference rather than a disadvantage: These days, many email providers (including Gmail) snoop into any ZIP file you send, and if it contains executable files, simply dont let you send it. Compress your executables using 7-Zip, and you can email them to anyone you like. 7-Zip doesnt always offer a superior compression ratio: When I tested it with a folder full of JPG files (which are already well-compressed), the resulting 7z archive was actually 78KB larger than a ZIP of the same folder produced by Windows Explorer. However, the archive was nearly 34MB in size, so a 78KB difference is negligible. When you first launch 7-Zip, its interface is simple and sparse: Just a list of files, along with six large toolbar buttons blog and a menu. No Wizards, welcome dialogs or any other pesky interruptions between you and your files. If youd like to give the interface a bit more oomph, hit F9 and 7-Zip will be transformed into a basic dual-pane file manager. You can even save up to ten folders as Favorites if you use it often for traversing your file system. All in all, 7-Zips user interface will probably not blow you away.

Original article here: http://www.pcworld.com/article/232451/7zip_64bit_version.html

3 Hide abbadon_34 , March 19, 2013 1:25 AM Nothing new here, 7zip > WinRar > WinZip for quite some time. Why the inclusion of MagicRAR is a mystery, maybe a paid (failed) review? I'd be interested in an examine of the Parity/Recovery option of WinRAR and others. While still far behind PAR2 (or even the shady ICE Ecc), it is an important feature in Archiving that deserves more attention. 2 Hide PreferLinux , March 19, 2013 1:47 AM mayankleoboy11. There is no difference between LZMA and LZM2 . Both are the same algorithm. The only difference is LZMA is limited to 2 threads. LZMA2 is much more threaded, but uses double the amount of RAM.

Original article here: http://www.tomshardware.com/reviews/winrar-winzip-7-zip-magicrar,3436.html

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